oj.uz

Submission #939076

# Submission time Handle Problem Language Result Execution time Memory
939076 2024-03-06T05:23:27 Z ezzzay Network (BOI15_net) C++14
63 / 100
 7 ms 14680 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
bool vis[N];
vector<int>v[N];
vector<pair<int,int>>rts;
vector<int>vec;
void dfs(int a, int p=-1){
    if(v[a].size()==1)vec.pb(a);
    for(auto b:v[a]){
        if(b!=p){
            dfs(b,a);
        }
    }
}
signed main(){
    int n;
    cin>>n;
    for(int i=1;i<n;i++){
        int a,b;
        cin>>a>>b;
        v[a].pb(b);
        v[b].pb(a);
        rts.pb({a,b});
    }
    dfs(1);
    
    
    cout<<vec.size()/2+vec.size()%2<<endl;
    for(int i=0;i<(vec.size()+1)/2;i++){
        cout<<vec[i]<<" "<<vec[i+vec.size()/2]<<endl;
    }
    
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:34:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i=0;i<(vec.size()+1)/2;i++){
      |                 ~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7260 KB Output is correct
2 Correct 2 ms 7260 KB Output is correct
3 Correct 2 ms 7260 KB Output is correct
4 Correct 2 ms 7260 KB Output is correct
5 Correct 2 ms 7260 KB Output is correct
6 Correct 2 ms 7260 KB Output is correct
7 Correct 2 ms 7260 KB Output is correct
8 Correct 2 ms 7260 KB Output is correct
9 Correct 2 ms 7260 KB Output is correct
10 Correct 2 ms 7448 KB Output is correct
11 Correct 2 ms 7260 KB Output is correct
12 Correct 2 ms 7260 KB Output is correct
13 Correct 2 ms 7260 KB Output is correct
14 Correct 2 ms 7260 KB Output is correct
15 Correct 2 ms 7260 KB Output is correct
16 Correct 2 ms 7260 KB Output is correct
17 Correct 2 ms 7272 KB Output is correct
18 Correct 2 ms 7260 KB Output is correct
19 Correct 2 ms 7260 KB Output is correct
20 Correct 2 ms 7260 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7260 KB Output is correct
2 Correct 2 ms 7260 KB Output is correct
3 Correct 2 ms 7260 KB Output is correct
4 Correct 2 ms 7260 KB Output is correct
5 Correct 2 ms 7260 KB Output is correct
6 Correct 2 ms 7260 KB Output is correct
7 Correct 2 ms 7260 KB Output is correct
8 Correct 2 ms 7260 KB Output is correct
9 Correct 2 ms 7260 KB Output is correct
10 Correct 2 ms 7448 KB Output is correct
11 Correct 2 ms 7260 KB Output is correct
12 Correct 2 ms 7260 KB Output is correct
13 Correct 2 ms 7260 KB Output is correct
14 Correct 2 ms 7260 KB Output is correct
15 Correct 2 ms 7260 KB Output is correct
16 Correct 2 ms 7260 KB Output is correct
17 Correct 2 ms 7272 KB Output is correct
18 Correct 2 ms 7260 KB Output is correct
19 Correct 2 ms 7260 KB Output is correct
20 Correct 2 ms 7260 KB Output is correct
21 Correct 2 ms 7260 KB Output is correct
22 Correct 4 ms 7532 KB Output is correct
23 Correct 4 ms 7516 KB Output is correct
24 Correct 5 ms 7516 KB Output is correct
25 Correct 5 ms 7668 KB Output is correct
26 Correct 3 ms 7516 KB Output is correct
27 Correct 3 ms 7516 KB Output is correct
28 Correct 4 ms 7516 KB Output is correct
29 Correct 3 ms 7516 KB Output is correct
30 Correct 2 ms 7260 KB Output is correct
31 Correct 3 ms 7516 KB Output is correct
32 Correct 2 ms 7260 KB Output is correct
33 Correct 2 ms 7260 KB Output is correct
34 Correct 2 ms 7260 KB Output is correct
35 Correct 2 ms 7260 KB Output is correct
36 Correct 2 ms 7260 KB Output is correct
37 Correct 2 ms 7516 KB Output is correct
38 Correct 2 ms 7516 KB Output is correct
39 Correct 2 ms 7256 KB Output is correct
40 Correct 2 ms 7260 KB Output is correct
41 Correct 2 ms 7260 KB Output is correct
42 Correct 2 ms 7516 KB Output is correct
43 Correct 3 ms 7516 KB Output is correct
44 Correct 2 ms 7260 KB Output is correct
45 Correct 2 ms 7260 KB Output is correct
46 Correct 3 ms 7516 KB Output is correct
47 Correct 2 ms 7260 KB Output is correct
48 Correct 2 ms 7260 KB Output is correct
49 Correct 3 ms 7516 KB Output is correct
50 Correct 2 ms 7260 KB Output is correct
51 Correct 2 ms 7256 KB Output is correct
52 Correct 2 ms 7512 KB Output is correct
53 Correct 2 ms 7516 KB Output is correct
54 Correct 2 ms 7260 KB Output is correct
55 Correct 2 ms 7260 KB Output is correct
56 Correct 2 ms 7260 KB Output is correct
57 Correct 2 ms 7768 KB Output is correct
58 Correct 4 ms 7516 KB Output is correct

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7260 KB Output is correct
2 Correct 2 ms 7260 KB Output is correct
3 Correct 2 ms 7260 KB Output is correct
4 Correct 2 ms 7260 KB Output is correct
5 Correct 2 ms 7260 KB Output is correct
6 Correct 2 ms 7260 KB Output is correct
7 Correct 2 ms 7260 KB Output is correct
8 Correct 2 ms 7260 KB Output is correct
9 Correct 2 ms 7260 KB Output is correct
10 Correct 2 ms 7448 KB Output is correct
11 Correct 2 ms 7260 KB Output is correct
12 Correct 2 ms 7260 KB Output is correct
13 Correct 2 ms 7260 KB Output is correct
14 Correct 2 ms 7260 KB Output is correct
15 Correct 2 ms 7260 KB Output is correct
16 Correct 2 ms 7260 KB Output is correct
17 Correct 2 ms 7272 KB Output is correct
18 Correct 2 ms 7260 KB Output is correct
19 Correct 2 ms 7260 KB Output is correct
20 Correct 2 ms 7260 KB Output is correct
21 Correct 2 ms 7260 KB Output is correct
22 Correct 4 ms 7532 KB Output is correct
23 Correct 4 ms 7516 KB Output is correct
24 Correct 5 ms 7516 KB Output is correct
25 Correct 5 ms 7668 KB Output is correct
26 Correct 3 ms 7516 KB Output is correct
27 Correct 3 ms 7516 KB Output is correct
28 Correct 4 ms 7516 KB Output is correct
29 Correct 3 ms 7516 KB Output is correct
30 Correct 2 ms 7260 KB Output is correct
31 Correct 3 ms 7516 KB Output is correct
32 Correct 2 ms 7260 KB Output is correct
33 Correct 2 ms 7260 KB Output is correct
34 Correct 2 ms 7260 KB Output is correct
35 Correct 2 ms 7260 KB Output is correct
36 Correct 2 ms 7260 KB Output is correct
37 Correct 2 ms 7516 KB Output is correct
38 Correct 2 ms 7516 KB Output is correct
39 Correct 2 ms 7256 KB Output is correct
40 Correct 2 ms 7260 KB Output is correct
41 Correct 2 ms 7260 KB Output is correct
42 Correct 2 ms 7516 KB Output is correct
43 Correct 3 ms 7516 KB Output is correct
44 Correct 2 ms 7260 KB Output is correct
45 Correct 2 ms 7260 KB Output is correct
46 Correct 3 ms 7516 KB Output is correct
47 Correct 2 ms 7260 KB Output is correct
48 Correct 2 ms 7260 KB Output is correct
49 Correct 3 ms 7516 KB Output is correct
50 Correct 2 ms 7260 KB Output is correct
51 Correct 2 ms 7256 KB Output is correct
52 Correct 2 ms 7512 KB Output is correct
53 Correct 2 ms 7516 KB Output is correct
54 Correct 2 ms 7260 KB Output is correct
55 Correct 2 ms 7260 KB Output is correct
56 Correct 2 ms 7260 KB Output is correct
57 Correct 2 ms 7768 KB Output is correct
58 Correct 4 ms 7516 KB Output is correct
59 Runtime error 7 ms 14680 KB Execution killed with signal 11
60 Halted 0 ms 0 KB -